动词短语
中文翻译：追溯到过去
同义词：
['post hoc', 'retrospective']
例句：
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1. The law was changed to ex post facto, which is unfair.
法律被更改为追溯到过去，这是不公平的。
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2. The government's decision was made after the event, not before.
政府的决策是在事情发生后才做出的，不是事先的。
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3. The company's actions were ex post facto, as they violated the agreement.
公司的措施是追溯到过去，因为它们违反了协议。